Power table for sewing machines



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WITNES S Aug. 21, 1928. 1,681,896

6. M. EAMES ET AL POWER TABLE FOR SEWINGMACHINES Original FildkJan- 1 1925 2. Sheets-Sheet 2 I A I A LC;

- v INVENTOR @Qfifl gw|TNEsss BY 2 ATTORNEY- Patented Aug. 21, 1928.

UNITED STATES PATENT, OFFICE.

GEORGE M. EAMES, OF BRIDGEPORT, CONNECTICUT, AND IRVING F. WEBB, OF ELIZA- BETH, NEW JERSEY, ASSIGNORS TO THE SINGER MANUFACTURING COMPANY, OF ELIZABETH, NEW JERSEY, A CORPORATION OF NEW JERSEY.

POWER TABLE FOR SEWING MACHINES.

Application. filed January 15, 1925, Serial No. 2,540. Renewed January 28, 1928- This invention relates to improvements in power-tables for sewing and like machines and has for its object to increase the range of adaptability of power-tables to the different vrequirements of commercial usage.

The present invention is equally applicable to flat and trough top power-tables of either the single or double type, as well as topower tables comprising a plurality of either single or double alined sections of either type.

Each power-table section preferably comprises end standards sustaining for vertical adjustment, a table-top supporting end rail, the table-top being provided with driving belt apertures suitably located for the particularvariety of driven machine placed thereuponv Each of the end standards includes a vertically adjustable cross-bar upon which a power-transmitter supporting member is mounted for horizontal adjustment, said member spanning the cross-bars below and longitudinally of the table-top. Clamped upon said supportingmember so as to be adjustable lengthwise thereof and angularly thereupon independently of the table-top is an electric-transmitter of any approved type comprising a complete driving unit including an electric-motor, a driving pulley and a treadle-controlled clutch whereby said pulley may be at will operatively coupled with the electric-motor. The transmitter-pulley and the driven machine pulleyare connected by driving belt passing through the table-top belt-apertures 7 The present improved power-table there fore provides for vertical adjustment of the table-top without changing the driving belt, because the power-transmitter position may be readily correspondingly adjusted. I, Tabletop substitutions may be readily made for different varieties of machines, as occasion demands in commercial usage, because the transmitter is supported independently of the table-top and its mounting meets the different requirements of adjustment necessary for proper alinement of the driving and driven pulleys with the correspondingly located table-top belt-apertures Not only may the necessary alinement of the pulleys be readily effected, but thereafter any slack in the belt due to stretching may be taken up by changing'the transmitter position by means of the adjustments provided.

The transmitter supporting member is in the form of a tubular bar affording a conduit for the electric current leads and it will be apparent that when the power-table com prises a plurality of alined sections, said tubular supporting member may serve as a con duit for all of the several current leads, therebyproviding a simple solution for all safety requirements. A feature of the present improvement is the facility with which a power-table of the described character may be installed to meet different factory regulations and as previously pointed out the nature of its construction is such as to thereafter more fully meet commercial requirements than was heretofore possible.

In the accompanying drawings, Fig. 1 is a. front side elevation of a portion of a troughtype power-table for sewing and like machines, illustrative of the present improvement. Fig. 2 is an end elevation, partly in section of the same. Fig. 3 is a detail sec tional view of a portion of the cross-bar of a tablestandard, illustrating the transmitter supporting-bar clamping means.

It is to be understood that only so much of a power-table is shown in the drawings as is deemed essential to an understanding of the present invention and it will be obvious that the present improvementis equally adaptable to flat and trough-types of tabletops, as well as to single and double table-sections employed individually or in a plurality of alined sections, all of which types are common and well known in this art. v

Referring to the drawings, a portion of a trough-type, doublepower-table section is shown as comprising a horizontally disposed table-top portion 1 and a trough 2, It is preferred to support this table-top by only end standards to facilitate setting up of the table and subsequent table-top substitutions. Only the front portion of one of'the end standards is shown in the accompanying drawings, the rear leg of said standard having the same construction as the front leg and the other standard or standards being duplicates of that herein disclosed.

Thetable-top 1 overlies and is removably clamped at each end upon an inverted U- shaped channel-bar 3 Whichtherefore constitutes a transverse supporting rail, there being a similar rail (not shown) at the op oto longitudinal end. ofsaidtable-top. he

means employed for clamping the table-top upon each supporting rail is shown as com- -prising an upper clamp-plate 4 disposed transversely of the length of the tabletop; bolts as 5 passing through said clamp-plate 4 and the table-top, and spaced lower clampplates as 6 bridging the depending members of the rail 3, said bolts being secured by nuts as 7. Suitably riveted upon each rail 3 so as to depend therefrom are" two U-shaped channel-bars 8 (only one of which is shown), each constituting a vertically adjustable member of a two-part table-leg. The legmember 8 is slidingly disposed within a similarly shaped leg-member 9, said members being secured in relatively adjusted positions by means of a bolt 10, nut 11 and an elongated slot 12 provided in the leg member 8.

Thelegmembers 9 at each end of the table are connected by an inverted U-shaped channel-bar or cross-bar 13, the top wall 14 of which has its ends turned down to form end walls 15. a The end walls 15 are each secured by a bolt 16 and a nut 17 upon a leg-member 9, which for this purpose is provided with an elongated slot 18 permitting vertical adjustment of the cross-bar 13. Sustained by the cross-bars 13 is an electric-transmitter supporting member in the form of a tubular bar 19 disposed longitudinally of the table,

said bar 19 being clamped for horizontal adjustment upon said cross-bars at each end of a tablesection. The bar clampmg means comprises, in each instance, a cap-member 20 i and a complemental member 21, which latter rests upon the cross-bar top-wall 14. The rod clamping members are secured upon the cross-bar 13 by bolts as 22 passing through elongated slots 23 in the top-wall 14, said bolts, being each secured by a nut 24 bearing 7 against a cross-bar bridging plate 25. This transmitter 26 which may construction evidently provides for horizontaladjustment of the supporting bar 19 upon the cross-bar 13.

Mounted upon the supporting bar 19'for adjustment longitudinally of a table-section and a-ngularly about said bar, is an electricbe of any approved type. The electric-transmitteremployed in the present instance is constructed substantially"in accordance with the disclosure in the U. S. patent to P. A. Herr, No. 1,514,083,

Nov. 4', 1924, to which reference may be made.

for details of construction of the transmitter. In general, the electric-transmitter herein employed, in common with other transmitters of this type, comprises a complete driving unit consisting of an electric-motor 27 of which the shaft (not shown) may be at will coupled with'or uncoupled from a drivingpulley 28 by manipulation of a treadle-aetuated lever 29. The lever 29 is pivotally mounted upon one of two brackets 30, having supporting flanges as 31 upon which the electric-transmitter feet 32 are secured by bolts as 33. The lower ends of the brackets are each bifurcated to 'form a depending fork 34 which straddles the supporting bar 19 and is clamped in adjusted position thereupon by means of a set-screw 35 threaded into a plate 36 bridging the fork-branches. The forkbranches are preferably formed to converge toward the base of the openingbetween them whereby a three-point contact on the bar is obtained by said fork-branches and set-screw 35.

The tubular supporting bar 19 affords a conduit for electric-current leads. In the present instance a cable 37, connected with any suitable power source, is conducted through the tubular bar 19 and emerges through an aperture 38 provided in said bar and an aperture 39 provided in an outlet-box 40 suitably clamped upon the bar 19 in an alined position of said apertures'38 and 39. The leads of cable 37 are spliced within the Outlet-box to the wires of another cable connected in regulation manner with a switch 41, said switch being connected by a current conducting cable 42 with the motor 27. The switch 41 is in the present instance carried by a casing 43 depending from a lateral arm 44 of one ofthe clamp-plates 6. i

From the foregoing description, it will be apparent that the power-transmitting unit is supported entirely independent of the tabletop 1 so that adjustments and substitutions of table-tops may be readily made independently of the transmittermounting. The complete transmitter may however be adjusted vertically by an adjustment of the position of the cross-bars 13 upon theleg members 9; horizontally in a direction crosswise of the table by shifting the supporting bar clamping means 20, 21 upon the cross-bars l3, and longitudinally of the table by shifting the transmitter brackets 30 longitudinally of the bar 19. In addition the electric-transmitter may be adjusted, as'a unit, angular-1y about the bar 19 by manipulation of the set-screws 35. These unit adjustments of the combined motor and transmitter obviously provide for the shifting of the driving pulley to the different positions it must occupy according to the positions of the belt-apertures of the tabletops employed for different varieties of machines, as well as to take up slack in the driving belt 45 which connects the transmitter pulley 28 with the driven pulley 46 of the sewing machine 47 sustained by the table-top 1. The present construction of power-table therefore fully meets the different commercial requirements in the matter of ready installation; adaptability for diflerent varieties of driven machines, an d safety for theoperators.

Having thus set forth the nature of the invention, what we claim herein is 1. A power-table for sewing and like machines comprising a table-top, table-top end standards, a tubular supporting member sustained by said standards and atlording a conduit for electric-current leads, and an electric-transmitter mounted upon said member.

2. A power-table for sewing and like Inachines comprising a table-top, table-top standards, means for securing the table-top for vertical adjustment upon said standards, a tubular supporting member secured for horizontal adjustment upon said standards affording a conduit for electric current leads, and an electric-transmitter mounted upon said supporting member independently of said table-top.

3. A power-table for sewing and like machines comprising a table-top, table-top end standards, a tubular supporting member sustained by said standards and alfording a conduit for electric-current leads, an electrictransmitter, and means for securing said transmitter for adjustment longitudinally of and angularly about said member.

4. A. power-table for sewing and like inachines comprising a tabletop, table-top standards, a tubular supporting member sustained by said standards and atlording a conduit for electric-cu "rent leads, an electrictransinitter secured upon said member, an outlet box mounted upon said member at point of emergence of said leads from said member, and an electric-switch sustained by one of said standards for connecting said current leads With said electrio-transmitter.

5. A power-table for sewing and like inacliines comprising a table-top, table-top end standards, a tubular supporting member sustained by said standards ali ording a conduit for electric current leads, electric-tansmitter, a supporting brack t for said transmitter having a fork straddling said mem her, and means for clamping the bracket for upon the supporting member.

In testimony whereof, We have signed our names to this specification.

GEORGE M. EAMES. IRVING F. WEBB. 

